Carbon pool densities and a first estimate of the total carbon pool in the Mongolian forest‐steppe

Abstract

The boreal forest biome represents one of the most important terrestrial carbon stores, which gave reason to intensive research on carbon stock densities. However, such an analysis does not yet exist for the southernmost Eurosiberian boreal forests in Inner Asia. Most of these forests are located in the Mongolian forest-steppe, which is largely dominated by Larix sibirica. We quantified the carbon stock density and total carbon pool of Mongolia's boreal forests and adjacent grasslands and draw conclusions on possible future change. Mean aboveground carbon stock density in the interior of L. sibirica forests was 66 Mg C ha(-1) , which is in the upper range of values reported from boreal forests and probably due to the comparably long growing season. The density of soil organic carbon (SOC, 108 Mg C ha(-1) ) and total belowground carbon density (149 Mg C ha(-1) ) are at the lower end of the range known from boreal forests, which might be the result of higher soil temperatures and a thinner permafrost layer than in the central and northern boreal forest belt. Land use effects are especially relevant at forest edges, where mean carbon stock density was 188 Mg C ha(-1) , compared with 215 Mg C ha(-1) in the forest interior. Carbon stock density in grasslands was 144 Mg C ha(-1) . Analysis of satellite imagery of the highly fragmented forest area in the forest-steppe zone showed that Mongolia's total boreal forest area is currently 73 818 km(2) , and 22% of this area refers to forest edges (defined as the first 30 m from the edge). The total forest carbon pool of Mongolia was estimated at ~ 1.5-1.7 Pg C, a value which is likely to decrease in future with increasing deforestation and fire frequency, and global warming.

Higher climate warming sensitivity of Siberian larch in small than large forest islands in the fragmented Mongolian forest steppe

“…The southern boreal forests in Mongolia ( c . 73,800 km², Dulamsuren et al., ) consist mostly of stands strongly dominated by Siberian larch ( Larix sibirica Ledeb.). Therefore, we selected monospecific L. sibirica forests for our study.…”

Forest Management In Mongolia – A Review Of Challenges And Lessons Learned With Special Reference To Degradation And Deforestation

“…Such disturbances can lead to increased carbon emissions for years after the disturbance (Government of Mongolia 2018). Dulamsuren et al (2016) predict that the carbon pool of Mongolia's forests will likely decrease further unless strong measures are taken at the national level.…”

Climate effects on vegetation vitality at the treeline of boreal forests of Mongolia

“…The actual total area of Mongolian southern boreal forest was estimated at 73 818 km 2 (Dulamsuren et al, 2016). The pro- MGST ( • C) TE f 11.0 ± 2.1Aa 11.7 ± 2.3Ba 11.1 ± 1.4Ca TE s 11.6 ± 2.5Ab 11.7 ± 2.7Ba 11.1 ± 1.7Ca LT f 11.5 ± 2.2Ab 12.1 ± 2.6Bb 11.5 ± 1.7Ab LT s 12.1 ± 2.3Ac 12.8 ± 2.4Bc 11.7 ± 1.6Cc UT f 8.4 ± 0.8Ad 7.9 ± 1.2Bd 8.9 ± 1.3Cd UT s 8.4 ± 0.9Ad 7.5 ± 1.2Be 8.5 ± 1.3Ce…”

“…They found that the biomass estimation method via NDVI was sufficient in low-density forests. Dulamsuren et al (2016) showed the NDVI to be well suited to estimating the tree biomass of Mongolian forests. The best fit of linear regression was found between biomass and the mean NDVI of April for the period 1999-2013.…”